Bolt-machine.



PATENTED DEC. 17, 1907.

H. OREHAN. BOLT MACHINE. APPLIOATION FILED MAY 20, 1907.

3 SHEETS-SHEET 1.

WiTN ESSE.

INVENTOR.

No. 873,727. PATENTED DEC. 17, 1907.

H. OREHAN. BOLT MACHINE.

APPLICATION FILED MAY 20, 1907.

3 SHEETSSHEET 2.

FIG.3

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[MW LL M af/mutzv No. 873,72'7/ PATENTED DEC. 17,. 1907.

H. GREHAN. BOLT MACHINE.

APPLICATION FILED MAY 20, 1907.

3 SHEETS-SHEET 3. V

h. 29 Imam-0., I "hi UNITED STATES PATENT OFFICE.

HUBER'I GREHAN, OF SHERIDAN, PENNSYLVANIA, ASSIGNOR TO OLIVER IRON AND STEEL COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

BOLT-MACHINE Specification of Letters Patent.

Application filed May 20, 1907- Serial No. 374,732.

The object of m invention is to provide a machine for threa 'ng and pointing bolts, in which the pointing is done just before the threading operation is finished, and the pointer'so operated and located as to quickly form the point without cutting any undue amount from the end .of the bolt.

Tothese ends my invention comprises the novel features hereinafter set forth and claimed. 7

In the accompanying drawing Figure 1 is a side elevation of my. improved machine; Fig. 2 is a plan view of same; Fig. 3 is an enlarged sectional detail of the head and spindle carrying the cutter; Fig. 4 is an enlarged cross section on the line 4'4 Fig. 3; Fig. 5 is a detail of the bolt holder; Fig. 6 is an en-- larged section through the threading die and cutter head; Fi 7 is a plan view of the threading die; Flgs. 8 and 9 are details of the cutting tool; Fig. 10 is a section through the belt-shiftingmechanism; 'andFig. 11 is a detail of conical head carrying cutters.

In the drawings the nu eral 2 designates a suitable stand or frame iii which, and in the standard 4, is journaled the shaft 3 carrying the pulleys 5, 6 and 7. The pulley 6'is loose on the shaft 3 while the pulleys 5 and 7 are tight. On the shaft 3 is the gear wheel 8 which meshes with the gear wheel 9 on the sleeve 10, said sleeve being loosely mounted on the hollow shaft 11. The sleeve 10 is mounted in suitable bearings 12 on the frame 2.

A pinion 13 on the shaft 3 meshes with a gear wheel 14 keyed to the hollow shaft 11. t the outer end of the hollow shaft 11 is the hollow head 15. Bolted to the front end of the head 15 is the plate 16 having the central In order to hold said threading gage the sides of said dies so as to hold them rigldly in position within the grooves 18.

Contained within the hollow shaft 1 1 is the spindle 22,. said spindlebeing secured to the sleeve 10 by means of the key 23 engaging the groove 24. A collar 25'is secured to. the outer end of the spindle 22 by means of the key 26. A set screw 27 passing through the collar25 secures said collar to said spindle.

At the forward end of thespindle 22 is the conical head 28 with the tapering wedges 29 adapted to secure the cutters 30. The conical head 28 is threaded at 31 and aconical chuck or collar.32 is adapted to engage the threads of said conical head 28, said chuck acting to hold the pointing knives 30 se curely' in position Within the grooves of the head 28. A bronze or other suitable collar '33surro'unds the spindle 22 in contact with the head 28, said collar forming the bearing for the spiral cone spring 34. The opposite endof the s Ii 34 bears against the inner face of the iiefi its forward position as indicated in Fig; 3.

Mounted onthe frame 2 is the bed plate 35, said bed plate having the guide-way 36 u onlwhich travels the carriage or slide 37.- uide plate s.38 are secured to the bed plate 35 by means of the screws 39'. Mounted on the carriage 37 is the bolt holder 40 which is secured to the carriage by the bolt 41. The bolt 41' passes through an enlarged opening 42 in the ho'lderand the head 43 of said bolt engages the groove. 44 in the carriage 37.

engage sai bolt holder 40 to secure the same to said carriage. In this manner the ad ustment of the bolt holder 40 is rovided for to suit different len ths of be ts. The bolt holder 40 is provi ed with the jaw 46 to receive the head of the bolt to be threaded. The set screw 47 is adapted to bear against this jaw 46 to prevent said jaw from rislng 1n 15. The tendency of the spring 34 is to hold the spindle normally in A Screws 45 Cpass through thecarriage 37 and collar 62.

knives.

engage the pulley 5 to reverse the direction of rotation of the hollow shaft 11. One or the other of the belts 53 or 54 is always in engagement with the loose pulley 6. A belt shifter 55 is provided engaging the belts 53 and 54, said belt' shifter being operated by means of the spring actuated trip 56 in the path of the rod 57. This rod 57 is connected to the downwardly-projecting arm 58 of the carriage 37. The rod 59 passes through an opening 60 in the arm 58, said rod having the collars 61 and 62. The trip 56 engages the Secured to'the opposite end of the rod 59 is the lever 63 pivoted at 64. At the upper end of the lever 63 is the slot 65 with which a pm engages securing said lever to the rod 66. The plunger 67 is connected to therod 66 and a key 68 secures said plunger to the shifter 55, said key moving in the slot 68*. A spring 69 is interposed between the plunger 67 and the plug 70. i

When my improved machine is in operation the operator places a bolt with its head in the aw 46 of the bolt holder, whereupon the lever 48 is thrown forward, moving the carriage 37 in its guide-way and bringing the end of the bolt to be threaded into engagement with the threading dies 19. As the power is conveyed from the shaft 3 to drive the hollow shaft 11 said shaft is rotated and as, it rotates the shank of the bolt is drawn into the dies and the threading operation begins. As the bolt is fed forward into the threading dies the carriage 37 is moved forward in its guide-way. The threading operation continues until almost the desired amount of thread has been formed upon the shank of the bolt, whereupon the end of the bolt to be pointed then comes in contact with the pointing knives 30. As the bolt is fed into contact with these knives the spindle 22 will yield slightly owing to the spring 34, and as it recedes the pointing operation continues. Since the spindle 22 is driven at a higher-rate of speed than the hollow shaft 11, the cutting operation takes place rapidly,

and as a consequence the boltdoes not have.

to be held so long in contact with the cutting By the time the bolt has been threaded the pointing has been completed. In this manner the pointing is done very rapidly and without removin any more metal than necessary to make the point, the spring 34 permitting the yielding of the spindle but at the same time offerlng sufficient resistance to hold the cutters up 1n contact with the bolt with thenecessary force to properly point the bolt. As soon as the bolt has been properly pointed the rod 57 comes in contact wlth the trip 56, whereupon the rod 59 is released and the lever 63 is moved, carrying with it the shifter 55, and

the belt 54 is shifted from the loose ulley 6 to the tight pulley 5 while the bet 53 is shifted from the tight pulley 7 to the loose pulley 6. In this manner the shaft 3 is reversed and through the gearing described the shaft 22 is likewise reversed so that the bolt is caused to travel back out of the diescarrying with it in its movement the carriage 37 until said carriage assumes its normal position as indicated in Fig. 2. After the bolt is released from the threading jaws the arm 58 comes in contact with the collar 61 on-the rod 59 and advances said rod until the collar 62 passes the trip 56 and holds said rod in this position. The movement of rod 59 will shift the belt 53 to the tight pulley 7 again.

The machine is then in position to receive another bolt which is fed to the dies in the manner hereinbefore described. It is apparent that a number of the bolt cutting and pointing devices may be arranged side by side in one frame so that one operator can attend to and feeda number of machines at one time. Byhaving the spindle carrying the cutting knives traveling at a higher 'rate of speed than the threading dies the operation of'cutting is done very rapidly while at the same time only the requisite amount of metal is removed to give the proper point and the length of the bolt is not unduly shortened by being held too long in contact with the knife'to' give the proper amount of pointing. The cone spring provided for the cutter spindle does not act to increase the pressure, as the spindle recedes, but the resistance ofiered by the'cone spring is substantially the same at all points, so that no increased pressure is exerted by the knives as the spindle recedes.

What I claim is: I

1. In a bolt machine, the combination of a rotary hollow shaft, threading dies carried thereby, a rotary spindle in said shaft longitudinally movable thereof, a pointing device carried by said spindle, and means for irfidependently rotating said spindle and said s aft.

2. In a bolt machine, the combination of a rotary hollow shaft, a rotary s )indle insaid shaft, a power shaft, a loose sleeve onsaid hollow shaft, a gear on said sleeve, a gear on said power shaft meshing therewith, connections between said sleeve and said spindle,

and gearing connections between said power shaft and said hollow shaft.

' In testimony whereof, I the said HUBERT CREHAN have hereunto set my hand.

HUBERT CREHAN.

Witnesses:

ROBERT C. 'TOTTEN,

Ronr. D. TorrnN. 

